#include <bits/stdc++.h>
using namespace std;
int ans,d[10];
int main(){
	int a,b;
	cin>>a>>b;
	for(int i = a;i <= b;i++){//1000000
		int p = i;
		int k = 0;
		for(int j  = 0;j <= 8;j++)  d[j]=0;
		while(p>0){
			d[++k] = p%10;
			p/=10;
		}
	
		int ok = 0;
		sort(d+1,d+k+1);
		for(int j = 1;j <= k;j++){
			if(d[j]!=j-1){
				ok=1;
				
			}
		}
		if(!ok){
			ans++;

		}
		
	}
	cout<<ans<<endl;
	return 0;
}